drm/msm/dpu: check for valid hw_pp in dpu_encoder_helper_phys_cleanup

[ Upstream commit 7f3d03c4 ]

The commit 8b45a26f

 ("drm/msm/dpu: reserve cdm blocks for writeback
in case of YUV output") introduced a smatch warning about another
conditional block in dpu_encoder_helper_phys_cleanup() which had assumed
hw_pp will always be valid which may not necessarily be true.

Lets fix the other conditional block by making sure hw_pp is valid
before dereferencing it.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: ae4d721c

 ("drm/msm/dpu: add an API to reset the encoder related hw blocks")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/574878/
Link: https://lore.kernel.org/r/20240117194109.21609-1-quic_abhinavk@quicinc.com
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>